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Finding the Fourth Proportional to 720.93, 993.96 and 553.07

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Solution

The fourth proportional to 720.93, 993.96 and 553.07 is: 762.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.93 : 993.96 = 553.07 : x
  2. Step 2: Convert to fraction form
    720.93/993.96 = 553.07/x
  3. Step 3: Cross multiply
    720.93x = 993.96 × 553.07
  4. Step 4: Simplify right side
    720.93x = 549,729.46
  5. Step 5: Solve for x
    x = 549,729.46/720.93
  6. Step 6: Final answer
    x = 762.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.